Drill-spindle-adjusting mechanism



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DRILL-SPINDLE-ADJUSTING Application filed September 14, 1921.

To alt Be it known that I, ROBERT F. Seo'rr, a citizen of the United States, residing at -Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain Improved Drill-Spindle-Adjusting Mechanism, of which the following is a speciiication.

rlhis invention is designed to provide improved mechanism for adjusting the relation between drilling spindles and their bearings, when required by wear, particularly in constructions; adapted for use in multiple spindie drills. The improvements cii'ect and maintain, accurately and securely, a slight or tine adjustment, by which proper compensation can be made tor very slight wear and the parts kept at all times in proper working relation.

In the accompanying drawings, Fig. l is a broken part sectional side elevation ot' a drill spindle together with bearing and feeding means, constructed in accordance with my invention; Fig. 2 is a broken longitudinal sectional view in illustration of a detached spindle with associated parts embodying the invention; Fig. 3 is an enlarged sectional view taken on the line 3X`3X ot Fig. 2; and Fig. 4 is an enlarged sectional view taken on the line 4X-4X of Fig, 2.

The mechanism shown in the drawings comprises a bearing 1, as a multiple spindle radius bar, in which is disposed a longitudinally movable bushing or journal bearing 2, the bearing 1 having therein the journalled adjusting screw 3 (parallel to the bushing) which engages the screw threads l cut in the periphery of the bushing longitudinally thereof to conform with the threads of the screw 3. y

The spindle 5 for holding the tool has a stem 6 which extends through and is joui'- nalled in the bushing` 2, the upper end orl the stem having thereon a line screw thread 7 which is adapted to be fed in an interiorly threaded tubular body 8 of the universal joint knuckle 9, the latter being connected with and operated by the universal joint knuckle l0 in a usual manner.

The spindle 6 is provided with a longitudinal slot 1 extending transversely through its axis and its threaded upper end, from side to s1de, and the part 8 is provided 12 extending therethrough .ll/IECHANISM.

Serial No. 500,578.

transversely to the axis thereof, in quadrantal relation, so that the axes of the holes shall lie in a plane transverse to the axis of the spindle and passing through the slot 11 in various longitudinal positions, the slot being substantially longer and of less width than the diameters of the holes.

A taper-pin 13, having sides 14,

of the slot to provide a fairly broad surface bearing for transmitting the force through the coupling to the spindle in the driving operation,

A bearing 15 at the bottom of the bushing 2 and a bearing 16 at the bottom of the spindle 6 engage the respective rings 17 and 18, between which are disposed the balls 19, forming therewith an antiizriction bearing, the rings and balls being encased by a jacket 20 be finely adjusted adjusted relation .ifor instance,

and firmly secured in the by this mechanism. the screw threads 7 are cut 32 to the inch and the spindle 6 is turned through a quarter of a revolution, a longitudinal adjustment of 1/128th, of an inch is effect-ed. This adjustment is held by driving the pin 13 through the registered openings oies 12 for the passage of the pin 13 throughout the necessary range of adjust ment, the pin holding the parts 6 and 8 against relative turning' movement, and the threads preventing relative movement.

Having described my invention, I claim l. A drill spindle adjusting mechanism comprising a bearing, in combination with a spindle journalled therein, and means for revolving said spindle in said bearing, said spindle having a threaded end provided with a hole extending transversely therethrough, said means provided with an interiorly threaded member engaging said threaded spindle end and having a hole adapted to register `with said hole first named, one of said holes having the form or" a slot extending inthe direction oi the axis longitudinal of said bearing, and a pin adapted to pass a bushing in said bearing and means for through said slot and holes aforesaid for ieeding said bushlng longitudinally in said ixing said spindle to said member. hearing, of a drill chuck spindle jour- 20 E2. A drill spindle adjusting mechanism nalledk in said bearing, said spindle haroomprising the combination with a bearing ing a threaded end with a slot entendand a spindle journalled therein, said spining therethrough, 'an internally thread dle provided With a threaded end having ed member adapted for engaging said therethrough a slot extending longitudinally threaded end and said bushing, said m'em- 25 thereof, of an internally threaded member her having holes therein adapted to regisadapted for engaging said threaded end and ter with said slot in different longitudisaid bee-ring, said member having holes nal relations of said spindle to said therein adapted to register with said slot in member, and a pin adapted to pass through dii'erent relations oi' said spindle and memsaid holes and slot. 30

ber, and a pin adapted to pass through said Signed at Philadelphia, in the county of g, holes and slot. Philadelphia and State of Pennsylvania,

23. A drill spindle adjusting mechanism this 12th day of September, 1921, comprising the combination with a bearing, V ROBT. F. SCOTT. 

